Disazo and trisazo intermediates for polyazo dyes containing a stilbenyl or 2,2&#39;-disulfostilbenyl radical

ABSTRACT

Disclosed are compounds of the formula, ##STR1## wherein THE X&#39;s are the same and are hydrogen or --SO 3  M, 
     Y is hydrogen, C 1-4  alkyl, C 1-4  alkoxy, hydroxy, halogen, --COOM or --SO 3  M, 
     K 1  and K 2  are the same or different and are both radicals of a coupling component, 
     Either A 1  is --SO 3  M and one of B 1  and C 1  is --SO 3  M, the other being hydrogen, 
     Or A 1  and C 1  are both hydrogen and B 1  is --SO 3  M, and 
     M is hydrogen or a non-chromophoric cation, their production and use in dyeing anionic dyeable substrates, for example, natural and regenerated cellulose, natural and synthetic polyamides, polyurethanes, polypropylene modified to contain basic groups, anodized aluminum, paper and, particularly, leather. The dyes are well-soluble in water, possess good resistance to acid, have relatively high substantivity especially to paper and leather and give good penetration dyeings with leather. 
     Compounds of the formula ##STR2## wherein Q is --NH 2 , --NO 2 , acylamino or K 3  --N═N--, 
     wherein K 3  is a coupling component radical free of diazotizable amino groups, 
     Q is --NH 2 , --NO 2 , acylamino or --N═N--K 4 , 
     wherein K 4  is a coupling component radical free of diazotizable amino groups, 
      with the proviso that when Q is K 3  --N═N--, Q&#39; is amino, nitro or acylamino, and 
     A 1 , b 1 , c 1 , each X and Y are as defined above, are useful as intermediates in the synthesis of the polyazo compounds.

This application is a continuation-in-part of our pending application Ser. No. 717,522, filed Aug. 25, 1976.

The invention provides compounds of formula I, ##STR3## wherein the X's are the same and are hydrogen or --SO₃ M,

Y is hydrogen, C₁₋₄ alkyl, C₁₋₄ alkoxy, hydroxy, halogen, --COOM or --SO₃ M,

K₁ and K₂ are the same or different and are both radicals of a coupling component,

either A₁ is --SO₃ M and one of B₁ and C₁ is --SO₃ M, the other being hydrogen,

or A₁ and C₁ are both hydrogen and B₁ is --SO₃ M, and

M is hydrogen or a non-chromophoric cation.

The X's are preferably --SO₃ M groups. Any halogen as Y is chlorine, bromine or fluorine, chlorine being preferred. Any alkyl or alkoxy as Y is preferably of 1 or 2 carbon atoms, methyl and methoxy being especially preferred. Y is preferably hydrogen, chlorine or --SO₃, any chlorine or --SO₃ M preferably being in meta-position to the azo-K₂ linkage. In the preferred compounds of formula I, A₁ is --SO₃ M and, of B₁ and C₁, C₁ is preferably --SO₃ M.

Where M is a non-chromophoric cation, the exact nature thereof is not critical and it may, for example, be any cation conventional in the anionic dyestuff art. As examples may be given the alkali metal, alkaline earth metal and optionally substituted ammonium cations, the preferred of which latter cations can conveniently be represented by the formula .sup.⊕ N(R)₄, wherein each R, independently, is hydrogen, C₁₋₃ alkyl or C₂₋₃ hydroxyalkyl, with the provisos that (i) where one or more R is hydroxyalkyl, at least one is hydrogen, and (ii) in any hydroxyalkyl, the hydroxy group is other than on the carbon atom attached to the nitrogen. As specific examples of cations may be given the triethylammonium, tri- and tetra-methylammonium, mono-, di- and tri-ethanol- and -isopropanolammonium, unsubstituted ammonium, potassium, lithium and sodium cations. From the production standpoint, alkali metal, especially sodium, cations are preferred.

The radicals K₁ and K₂ are conveniently derived from any coupling component conventional in the anionic dyestuff art, especially from those conventionally employed as terminal coupling components in polyazo anionic dyes. They are preferably free from azo linkages. The preferred coupling components from which the radicals K₁ and K₂ are derived are K₁ '--H and K₂ '--H, i.e. those of formulae (a) to (e), ##STR4## wherein R₁ is hydroxy or a primary, secondary or tertiary amino group conventional in coupling component radicals, preferably --OH, --NH₂, mono- or di-C₁₋₄ alkylamino, mono- or di-C₂₋₄ hydroxyalkylamino, mono-sulphomethylamino, monoarylamino, N--C₁₋₄ -alkyl-N--C₂₋₄ hydroxyalkylamino, N--C₁₋₄ alkyl-N-arylamino or N--C₂₋₄ hydroxyalkyl-N-arylamino, any aryl being naphthyl, unsubstituted or mono- or di-substituted by --SO₃ M, or phenyl, unsubstituted or substituted by up to 3 substituents selected from C₁₋₄ alkyl (max.3), C₁₋₄ alkoxy(max.2), nitro(max.2), chlorine(max.2), --COOM(max.1) and --SO₃ M(max.1),

R₂ is hydrogen, hydroxy, --NH₂, C₁₋₄ alkyl, C₁₋₄ -alkoxy, chlorine or acylamino, where acyl is any conventional acyl group in coupling component radicals, preferably phenylsulphonyl, tolylsulphonyl, phenylcarbonyl, C₁₋₄ -alkylcarbonyl or methylcarbonylmethylcarbonyl (acetoacetyl),

R₃ is hydrogen, C₁₋₄ alkyl, --SO₃ M or --COOM,

R₄ is --OH, --NH₂ or phenylamino, the phenyl being unsubstituted or substituted by C₁₋₄ -alkyl and/or C₁₋₄ alkoxy groups, preferably by up to 3 substituents selected from C₁₋₄ -alkyl(max.3) and C₁₋₄ alkoxy(max.2),

R₅ is hydrogen, --OH, --NH₂, --NHCH₂ SO₃ M or acylamino, acyl being as above defined,

m is 1, 2 or 3,

R₆ is hydrogen, C₁₋₄ alkoxy, or --COOM, being --COOM only when m is 1,

R₇ is acyl, as defined above,

R₈ is naphthyl, unsubstituted or mono- or disubstituted by --SO₃ M, or phenyl, unsubstituted or substituted preferably by up to three substituents selected from C₁₋₄ alkyl(max.3), C₁₋₄ alkoxy(max.2), chlorine(max.2), methylcarbonyl(max.1) and --SO₃ M(max.1),

R₉ is hydrogen or phenyl, unsubstituted or monosubstituted by --SO₃ M,

R₁₀ is C₁₋₄ alkyl or --COOM, and

R₁₁ is --OH or --NH₂,

and those coupling components, designated (fg), being the product of condensation, under acid conditions, of a compound or mixture of compounds of formula (f), ##STR5## and/or a compound or mixture of compounds of formula (g), ##STR6## R₁₃ to R₁₆, independently, being hydrogen, halogen, hydroxy or optionally substituted alkyl or alkoxy, and

M is as defined above,

with formaldehyde, the mol ratio of formaldehyde to the other compound(s) being at least 0.5:1, and at least 50 mol % of the other compound(s) containing a --COOM group.

In any C₁₋₄ alkyl substituted amino group as R₁, the alkyl group is preferably of 1 or 2 carbon atoms and in any C₂₋₄ hydroxyalkyl substituted amino group, the hydroxy group is other than on the α-carbon atom, preferably being on the β-carbon atom, the preferred C₂₋₄ hydroxyalkyl groups being C₂₋₃ hydroxyalkyl, especially β-hydroxyethyl. The preferred aryls in any aryl substituted amino group as R₁ are the unsubstituted and substituted phenyl radicals, in which any alkyl or alkoxy substituent is preferably methyl or methoxy, especially preferred arylamino groups as R₁ being of formula (ax), ##STR7## wherein Rx is hydrogen, --NO₂ or methyl,

Ry is hydrogen, --NO₂ or --SO₃ M, and

Rz is hydrogen, --COOM or methyl,

where two or more substituents selected from --NO₂, --COOM and --SO₃ M are present, such preferably being in meta-positions relative to each other, particularly preferred arylaminos as R₁ being ortho-tolylamino, phenylamino, 2-nitro-4-sulphophenylamino and 2-sulpho-4-nitrophenylamino.

The acyl as R₇ or in any acylamino as R₂ is preferably C₁₋₄ alkylcarbonyl, more preferably methylcarbonyl.

The phenyl, in any phenylamino as R₄, is preferably unsubstituted or mono- or di-, preferably mono-, substituted by methyl or methoxy.

Any C₁₋₄ alkyl or C₁₋₄ alkoxy on any phenyl as R₈ is preferably methyl or methoxy, respectively, the preferred phenyl significance of R₈ being unsubstituted phenyl and tolyl.

R₁ is preferably R₂₁, i.e. --OH, --NH₂, --N(CH₃)₂, --N(C₂ H₅)₂, --N(C₂ H₄ OH)₂, --NHCH₂ SO₃ M or monophenylamino (anilino), the phenyl group being unsubstituted or substituted by up to 3 substituents selected from methyl(max.3), methoxy(max.2), nitro(max.2), chlorine(max.2), --COOM(max.1) and --SO₃ M(max.1), the preferred phenylamino being of formula (ax) above. More preferably, R₁ is R₃₁, i.e. --OH, --NH₂, ortho-tolylamino, phenylamino, 2-nitro-4-sulphophenylamino, 2-sulpho-4-nitrophenylamino, --N(C₂ H₄ OH)₂ or --N(C₂ H₅)₂.

R₁ and R₂ are preferably ortho or meta to each other and when both are --OH, especially meta.

When R₂ is position meta position to R₁, it is preferably R₂₂, i.e. hydrogen, --OH, C₁₋₄ (preferably C₁ or 2)alkyl, --NH₂ or --NHCOCH₃, more preferably R₃₂, i.e. hydrogen, methyl, ethyl, --NH₂ or --NHCOCH₃.

When R₂ is position ortho position to R₁, R₁ is preferably R₂₁, as given above, more preferably R₄₁, i.e. --OH, --NH₂, --NHCH₂ SO₃ M or --N(C₂ H₅)₂, and R₂ is preferably R₂₀, i.e. hydrogen, C₁₋₄ alkyl, C₁₋₄ alkoxy, chlorine or acetylamino, more preferably R₃₀, i.e. hydrogen, methyl, methoxy or acetylamino, preferably up to a maximum of one of R₂₀ or R₃₀ and R₂₁ or R₄₁ containing a nitrogen atom.

R₃, when R₁ and R₂ are meta one to the other, is preferably para to R₁ and is preferably R₂₃, i.e. hydrogen, C₁₋₄ alkyl or --SO₃ M, more preferably R₃₃, i.e. hydrogen, methyl or --SO₃ M, but --SO₃ M only when R₁ and R₂ are both --NH₂.

R₃, when R₁ and R₂ are ortho one to the other and R₁ is hydroxy, is preferably R₄₃, i.e. C₁₋₄ alkyl (preferably methyl) or --COOM, the latter group being ortho to the hydroxy group as R₁.

R₃, when R₁ and R₂ are ortho one to the other and R₁ is an amino group, is preferably hydrogen.

When R₂ is hydrogen, R₃ is preferably other than hydrogen and, in the case when R₂ is hydrogen, R₁ is preferably hydroxy, R₃ being ortho thereto.

R₄ is preferably R₂₄, i.e. hydroxy, --NH₂ and, when R₅ is hydrogen or hydroxy, additionally phenylamino, the phenyl being unsubstituted or substituted by up to two substituents selected from methyl and methoxy, preferably being unsubstituted or monosubstituted by methyl or methoxy and more preferably being unsubstituted.

R₅ is preferably R₂₅, i.e. hydrogen, hydroxy, --NH₂ and, when R₄ is hydroxy, additionally tolylsulfonylamino, benzamido methylcarbonylamino (acetamido) or C₁₋₄ alkylcarbonylamino, preferably and, when R₄ is hydrogen or hydroxy, also --NHCH₂ SO₃ M.

Preferably, at least one of R₅ and R₆ is hydrogen.

When formula (b) contains two --SO₃ M groups they are preferably not in ortho relative positions.

Preferably, R₆ is C₁₋₄ alkoxy (of which methoxy is preferred) only when R₅ is hydrogen and m is 2.

Preferably, R₆ is R₂₆, i.e. hydrogen, methoxy or --COOM, being methoxy only when R₅ is hydrogen and m is 2 and being --COOM only when R₅ is hydrogen and m is 1. Most preferably R₆ is hydrogen.

R₇ is preferably R₂₇, i.e. C₁₋₄ alkylcarbonyl, more preferably methylcarbonyl.

R₈ is preferably R₂₈, i.e. phenyl, unsubstituted or substituted by up to 3 substituents selected from C₁₋₄ alkyl (preferably methyl) (max.3), C₁₋₄ alkoxy (preferably methoxy) (max.2), chlorine (max.2), methylcarbonyl (max.1) and --SO₃ M (max.1), more preferably R₃₈, i.e. methylphenyl or unsubstituted phenyl, of which the latter is especially preferred.

R₉ is preferably R₂₉, i.e. phenyl or monosulphophenyl.

R₁₀ is preferably R₂₁₀, i.e. methyl or --COOM, more preferably methyl.

R₁₁ is preferably hydroxy.

Preferred compounds of formula (a) are those of formulae (a₁) and (a₂) ##STR8## particularly (a₁₁) and (a₁₂) ##STR9## more particularly (a₂₁) and (a₂₂) ##STR10##

Preferred compounds of formula (b) are those of formula (b₁), particularly (b₂) and more particularly (b₃), ##STR11##

Preferred compounds of formula (c) are those of formula (c₁), particularly (c₂) and more particularly (c₃) ##STR12##

Preferred compounds of formula (d) are those of formula (d₁), particularly (d₂) and more particularly (d₃) ##STR13##

As regards the coupling component (fg), in the compounds of formulae (f) and (g), any alkyl or alkoxy radical is preferably of 1 to 4 carbon atoms, more preferably of 1 or 2 carbon atoms, except as stated below. As examples of substituents thereon may be given halogen, --COOM, cyano, hydroxy, C₁₋₄ alkoxy and hydroxy-(C₁₋₄)-alkoxy. Any alkoxy substituted by one of the last three mentioned substituents is preferably of at least 2 carbon atoms. Any halogen in the compounds of formulae (f) and (g) is preferably chlorine, but may also be fluorine, bromine or iodine.

The preferred significances of R₁₃, R₁₄ and R₁₆ are hydrogen, methyl, methoxy, hydroxy and chlorine, such, together with --O--CH₂ --COOM, being the preferred significances of R₁₅. At least one of R₁₃ and R₁₄ is preferably hydrogen. Most preferably, R₁₃, R₁₄ and R₁₅ are hydrogen. Most preferably, R₁₆ is methyl or a hydroxy group in meta-position to the hydroxy shown in formula (g).

As examples of compounds of formula (f) may be given salicylic, m-cresotic, 2,4- and 2,6-dihydroxybenzoic and 4-chloro-2-hydroxybenzoic acids and salts thereof, salicylic acid and salts thereof being particularly preferred.

As examples of compounds of formula (g) may be given phenol, resorcinol, o- or p-cresol, o- and p-chlorophenol, 3-methoxyphenol and 3-hydroxyphenoxyacetic acid.

In the production of coupling components (fg), where mixtures of both compounds of formula (f) and compounds of formula (g) are employed, such mixtures preferably contain at least 50 mol %, more preferably at least 80 mol %, of the compound(s) of formula (f), it being still more preferable to employ solely the compound(s) of formula (f). In the most preferred embodiment, the reaction is carried out solely between salicylic acid and formaldehyde.

The mol ratio of formaldehyde to the compound(s) of formula (f) or (g) is preferably no greater than 0.95:1, the preferred mol ratio being the range of from 0.7 to 0.9:1.

If desired, the formaldehyde may be produced in situ, e.g. using paraformaldehyde, the amount of formaldehyde liberating agent being chosen, however, such that the required amount of formaldehyde is liberated. It is preferred, in fact, to work with paraformaldehyde.

The condensation is conveniently carried out in aqueous medium, in aqueous/inert organic medium or in inert organic medium, suitable organic media being formic and acetic acids. It is preferred, however, to work in aqueous medium. Elevated temperatures are generally employed, preferably from 50° to 130° C., more preferably temperatures close to the boiling point of the reaction medium, e.g. 90° to 130° C., and optionally under pressure. Mineral acids may be employed, as desired, to create the acid conditions for the reaction. However, where the compounds of formula (f) or (g) are employed in free acid form, the acidity thereof is generally sufficient. Where mixtures of compounds of formula (f) and/or (g) are employed and one component compound of the mixture is markedly more reactive than the other(s), such compound is preferably added slowly over the course of the condensation reaction, conveniently dissolved in an inert solvent.

The resulting product may be isolated in conventional manner.

The product of the condensation is a mixture of a broad spectrum of oligomerous condensates and is used as such, without separation of the various oligomers.

The preferred coupling components (fg) are those which are soluble to at least 10% in water at neutral pH.

Those products obtained from the reaction of salicylic acid, or its salts, and formaldehyde are preferred which have a Z value, where Z=I(CH₂)/I(aromatic), where I(CH₂) is intensity of the signal of methylene protons appearing between 3.0-4.3 ppm, and I(aromatic) is intensity of the signal of aromatic protons appearing between 6.3 and 8.2 ppm, (both measured by means of the NMR spectrum at 60 MHz in dimethyl sulphoxide/D₂ O) of from 0.43 to 0.85, more preferably from 0.5 to 0.7.

The course of the condensation can be followed chromatographically and the end of reaction ascertained by the loss of odour of formaldehyde from the reaction mixture when the formaldehyde is not employed in excess.

The preferred coupling component (fg) is (fg₁), i.e. the product of condensation, under acid conditions, of salicylic acid, or a salt thereof, and, optionally, resorcinol or a cresol, with formaldehyde, the mol ratio of formaldehyde to the other component(s) being from 0.6:1 to 0.95:1, preferably 0.7:1 to 0.9:1, at least 80 mol % of the other components being salicylic acid or a salt thereof.

The most preferred coupling component (fg) is (fg₂), i.e. (fg₁), above, but in which the formaldehyde is condensed with salicyclic acid, or a salt thereof, alone.

Representative of the coupling components from which K₁ and K₂ are derived are K₁ "H and K₂ "H, i.e. compounds of the formulae ##STR14## in which Rp is hydrogen, --OH, --NH₂, --N(C₂ H₅)₂, --CH₃, --C₂ H₅ or unsubstituted phenylamino,

Rq is hydrogen, --CH₃ or --SO₃ M,

Rs is hydrogen or --CH₃,

Rt is --NH₂, --NHCOCH₃, unsubstituted phenylamino or --NH--CH₂ --SO₃ M,

Ru is --OH, --NH₂ or --NHCOCH₃,

Rw is --CH₃ or hydrogen, preferably hydrogen,

Rv is hydrogen, --CH₃ or --OCH₃, and

n is 1 or 2

and coupling components (fg₁), preferably (fg₂), as defined above.

In the most preferred compounds provided by the invention, the radicals K₁ and K₂ are derived from coupling components K₁ ''' and K₂ ''', i.e. compounds (a₂₁), (a₂₂), (b₃), (c₃), (d₃), (e) and (fg₁), (fg₁) preferably being (fg₂), as defined above.

In general, but depending on the nature of the radicals K₁ and K₂, i.e. the number of aromatic nuclei contained therein and the presence or otherwise of carboxy groups, the compounds of formula I contain from 3 to 9, preferably at least 4 sulpho groups.

The invention also provides a process for the production of compounds of formula I, comprising

(a) coupling the diazo derivative of a diamine of formula II, ##STR15## with a coupling component K₁ H and a coupling component K₂ H, in any desired order,

(b) obtaining a compound of formula I, in which K₁ is free from diazotisable amino groups by coupling the diazo derivative of an amine of formula III, ##STR16## in which K₃ is the radical of a coupling component and is free from diazotisable amino groups,

with a coupling component K₂ H, or

(c) obtaining a compound of formula I, in which K₂ is free from diazotisable amino groups, by coupling the diazo derivative of an amine of formula IV, ##STR17## in which K₄ is the radical of a coupling component and is free from diazotisable amino groups,

with a coupling component K₁ H.

The above processes may be carried out in conventional manner, process (a) being particularly suitable for production of single compounds of formula I in which K₁ and K₂ are the same and for the production of mixtures of compounds in which K₁ and K₂ are different, processes (b) and (c) being particularly suitable for the production of single compounds in which K₁ and K₂ are different.

Coupling with a component (fg), (fg₁) or (fg₂) is carried out in a strongly alkaline aqueous or aqueous/organic medium, the pH preferably being at least 10, more preferably at least 12. Low temperatures, e.g. from -10° to 30° C., preferably 0° to room temperature are employed. As examples or organic media can be given, for example, alcohols, tertiary aliphatic amines and amides.

Where a coupling component (fg₁) or (fg₂) is employed, there is a preferred ratio between the number of molecules of salicylic acid initially employed in the condensation reaction and the number of diazonium groups in the diazo derivatives compounds II to IV, such ratio being from 1 to 4:1, preferably 1 to 3:1.

The resulting compounds of formula I may be isolated and purified in conventional manner.

The compounds of formula II may be obtained by subjecting a compound of formula IX, ##STR18## in which Z₁ is --NO₂ or an acylamino group, and

Z₂ is --NH₂, --NO₂ or an acylamino group,

to reducing conditions when Z₁ and/or Z₂ is --NO₂ and/or to deacylation conditions when Z₁ and/or Z₂ is acylamino.

The compounds of formula IX may be obtained by coupling the diazo derivative of an amine of formula XI ##STR19## with a compound of formula XII, ##STR20##

The compounds of formulae III and IV may be obtained by subjecting, respectively, compounds of formulae V and VI, ##STR21## wherein Z is nitro or acylamino, ##STR22## to reducing conditions, when Z or Z₁ is nitro, or to deacylating conditions, when Z or Z₁ is acylamino.

The compounds of formulae V and VI may be obtained by coupling, respectively, to a coupling component K₃ --H or K₄ --H compounds of diazo derivatives of amines of formula VII or VIII, ##STR23##

The compounds of formula VII can be obtained from corresponding compounds in which instead of the terminal amino group there is a nitro or acylamino group by reduction or deacylation thereof, respectively, provided that when such group is nitro, Z is acylamino and when such group is acylamino, Z is nitro. The starting materials for such process and the compounds of formula VIII fall, of course, under formula IX.

The compounds of formulae XI and XII are either known or may be obtained from available starting materials in manner analogous to that for the known compounds.

The above reactions are carried out in conventional manner, e.g. reduction of nitro groups to amino groups by employing sodium sulphide as reducing agent and deacylation of acylamino groups to amino groups by employing basic conditions. The usual acylamino groups are the formamido and (C₁₋₄ -alkyl)carbonylamino groups. The preferred acyl groups are the formyl and acetyl groups, particularly the latter.

The intermediates of formula XIII, i.e., the compounds of the formula ##STR24## wherein each of A₁, B₁ and C₁ is independently hydrogen or --SO₃ M, with the proviso that when A₁ is --SO₃ M, one of B₁ and C₁ is --SO₃ M and the other is hydrogen and when A₁ is hydrogen, B₁ is --SO₃ M and C₁ is hydrogen,

Q is --NH₂, --NO₂, acylamino or K₃ --N═N--,

wherein K₃ is a coupling component radical free of diazotizable amino groups,

Q is --NH₂, --NO₂, acylamino or --N═N--K₄,

wherein K₄ is a coupling component radical free of diazotizable amino groups,

each X is hydrogen or --SO₃ M, with the proviso that the two X's are the same,

Y is hydrogen, C₁₋₄ alkyl, C₁₋₄ alkoxy, hydroxy, fluoro, chloro, bromo, --COOM or --SO₃ M, and

each M is hydrogen or a non-chromophoric cation, with the proviso that when Q is K₃ --N═N--, Q' is --NH₂, --NO₂ or acylamino,

also form part of the present invention.

Representative of the compounds of formula XIII are those where Q is --NH₂, --NO₂ or acylamino, and Q' is --NH₂, --NO₂ or acylamino, with those wherein any acylamino is formylamino or (C₁₋₄ alkyl)carbonylamino being preferred and those wherein any acylamino is formylamino or acetylamino being more preferred.

The compounds of formulae III, IV, VI and, especially, I are useful as anionic dyestuffs for dyeing substrates, whether textile or non-textile, dyeable using anionic dyes. Particular substrates are natural and regenerated cellulose, natural and synthetic polyamide, polyurethane, basic modified polypropylene, anodised aluminum and leather. Textile substrates may be in such forms as fibres, threads, filaments, non-wovens, felts, carpets, knitted, woven and finished goods. As examples of the natural fibre materials may be given cotton, wool and silk and of the synthetic fibre materials may be given nylon and basically modified polypropylene. Of particular interest is the use of the dyes, particularly the compounds of formula I, for the dyeing of cotton, cellulose non-woven fabrics, paper and leather, especially leather. The dyes may be applied in conventional manner, depending on the nature of the substrate to be dyed, e.g. using exhaust, pad-dyeing and printing techniques, in conventional amounts, e.g. up to the saturation level of the substrate. The dyeings obtained, depending on the particular dye employed, are dark blue, dark green and deep black and have satisfactory fastness properties. The dyes themselves are well soluble in water, show good resistance to acid and, especially on paper and leather, have relatively high substantivity and give good penetration dyeings with leather.

The dyes may be employed as such or in dye preparation form, optionally in admixture with other dyes.

The following Examples, in which all parts and percentages are by weight and the temperatures are in degrees centigrade, illustrate the invention.

EXAMPLE 1 ##STR25## 138 Parts of para-nitroaniline are diazotised in the usual manner with hydrochloric acid and sodium nitrite and are coupled at a pH of 1-3 with 319 parts of 1-amino-8-hydroxynaphthalene-3,6-disulphonic acid. The diazo compound derived from 400 parts of 4-amino-4'-nitrostilbene-2,2'-disulphonic acid is coupled at a pH of 9.5 with the monoazo compound obtained above. The dinitrodisazo compound thus obtained is reduced in the reaction mixture at 40° with a solution of 234 parts of sodium sulphide in water. The dyestuff is separated by sprinkling in common salt and adjusting the pH to 1.5. The dyestuff obtained is mixed with dilute hydrochloric acid and is tetrazotised by adding dropwise 140 parts of sodium nitrite solution. 216 parts of 1,3-diaminobenzene, dissolved in water, are added to the tetrazotised dyestuff, and they are coupled at a pH of 5-10. The dyestuff obtained is precipitated with acid. It is a dark powder which dyes leather, paper, natural and synthetic polyamides and cotton in deep black shades.

If 2-chloro-4-nitroaniline or 2-sulpho-4-nitroaniline is used instead of p-nitroaniline, black dyestuffs with similar properties are obtained. If 1-amino-3-hydroxybenzene or 3-hydroxy-2'-methyldiphenylamine is used instead of 1,3-diaminobenzene, a black dye with similar properties is obtained. If 1,3-diamino-4-sulphobenzene is used instead of 1,3-diaminobenzene, an easily soluble dyestuff is obtained with the same properties.

EXAMPLE X (Production of Coupling Component (fg)

276 Parts of salicyclic acid, 100 parts of 20% sodium hydroxide solution and 42 parts of paraformaldehyde are boiled at reflux for 10 hours. The resulting viscous melt, which no longer smells of formaldehyde, is dissolved with 2000 parts of 3% sodium hydroxide solution, 300 Parts of 30% hydrochloric acid are added quickly at 25° with good stirring. The condensation product in the form of a white precipitate is filtered off by suction, washed three times with water, dried at 100° in a vacuum and then ground to a powder.

Yield: 280 parts of a white powder with an acid equivalent weight of 160.

In Table 1 is given the structure of these and further dyestuffs which may be produced similarly to that of Example 1 and in the form of the free acid correspond to formula I, wherein the X's, A₁ and C₁ are sulpho, B₁ is hydrogen and Y, K₁ and K₂ have the definitions given in the corresponding columns, and M signifies hydrogen. Y being in meta-position to the K₂ -azo group.

                                      TABLE 1                                      __________________________________________________________________________                                      Shade of                                      Ex.                              dyeing on                                     No.                                                                               Y     K.sub.1 = K.sub.2       leather                                       __________________________________________________________________________     2  H                                                                                     ##STR26##              black                                         3  H                                                                                     ##STR27##              "                                             4  H                                                                                     ##STR28##              "                                             5  H                                                                                     ##STR29##              "                                             6  H                                                                                     ##STR30##              "                                             7  H                                                                                     ##STR31##              blue                                          8  H                                                                                     ##STR32##              "                                             9  H                                                                                     ##STR33##              green                                         10 H                                                                                     ##STR34##              blue                                          11 H                                                                                     ##STR35##              "                                             12 H                                                                                     ##STR36##              "                                             13 H                                                                                     ##STR37##              "                                             14 H                                                                                     ##STR38##              "                                             15 H                                                                                     ##STR39##              "                                             16 H                                                                                     ##STR40##              "                                             17 H                                                                                     ##STR41##              "                                             18 H                                                                                     ##STR42##              dark green                                    19 H                                                                                     ##STR43##              green                                         20 H                                                                                     ##STR44##              "                                             21 H                                                                                     ##STR45##              "                                             22 H                                                                                     ##STR46##              dark green                                    23 H                                                                                     ##STR47##              "                                             24 H                                                                                     ##STR48##              "                                             25 H                                                                                     ##STR49##              green                                         26 H                                                                                     ##STR50##              "                                             27 H                                                                                     ##STR51##              "                                             28 H                                                                                     ##STR52##              "                                             29 H     Product of Example X, above,                                                                           "                                                      used in an amount corres-                                                      ponding to 1 molecule of                                                       salicyclic acid originally                                                     condensed per diazonium group.                                        30 H                                                                                     ##STR53##              black                                         31 SO.sub.3 H                                                                            ##STR54##              "                                             32 SO.sub.3 H                                                                            ##STR55##              "                                             33 SO.sub.3 H                                                                            ##STR56##              blue                                          34 SO.sub.3 H                                                                            ##STR57##              "                                             35 SO.sub.3 H                                                                            ##STR58##              "                                             36 SO.sub.3 H                                                                            ##STR59##              green                                         37 SO.sub.3 H                                                                            ##STR60##              "                                             38 Cl                                                                                    ##STR61##              black                                         39 Cl                                                                                    ##STR62##              blue                                          40 SO.sub.3 H                                                                           "                       "                                             41 Cl                                                                                    ##STR63##              black                                         42 Cl                                                                                    ##STR64##              "                                             43 Cl                                                                                    ##STR65##              blue                                          44 Cl                                                                                    ##STR66##              "                                             45 Cl                                                                                    ##STR67##              "                                             46 Cl                                                                                    ##STR68##              "                                             47 Cl                                                                                    ##STR69##              green                                         48 Cl                                                                                    ##STR70##              "                                             49 Cl                                                                                    ##STR71##              "                                             50 Cl    Same as in Example 29   dark green                                    51 OCH.sub.3                                                                             ##STR72##              black                                         52 OCH.sub.3                                                                             ##STR73##              "                                             53 OCH.sub.3                                                                             ##STR74##              "                                             54 OCH.sub.3                                                                             ##STR75##              blue                                          55 OCH.sub.3                                                                             ##STR76##              "                                             56 OCH.sub.3                                                                             ##STR77##              "                                             57 OCH.sub.3                                                                             ##STR78##              "                                             58 OCH.sub.3                                                                             ##STR79##              "                                             59 OCH.sub.3                                                                             ##STR80##              green                                         60 OCH.sub.3                                                                             ##STR81##              "                                             61 OCH.sub.3                                                                             ##STR82##              "                                             62 OCH.sub.3                                                                            same as Example 29      dark green                                    63 OCH.sub.3                                                                             ##STR83##              black                                         64 H     Product of Example X, above,                                                                           dark green                                             used in an amount corresponding                                                to 1 molecule of salicyclic                                                    acid originally condensed per                                                  diazonium group.                                                      65 Cl    "                       "                                             66 OCH.sub.3                                                                            "                       "                                             67 SO.sub.3 H                                                                           "                       "                                             __________________________________________________________________________

example 68 ##STR84## 138 parts of para-nitroaniline are diazotised in the usual manner with hydrochloric acid and sodium nitrite and are coupled at a pH of 1-3 with 319 parts of 1-amino-8-hydroxynaphthalene-3,6-disulphonic acid. The tetrazo compound consisting of 370 parts of 4,4'-diaminostilbene-2,2'-disulphonic acid is coupled on one side at a pH of 5-10 with the monoazo compound obtained as above. After coupling, 199 parts of 3-hydroxy-2'-methyldiphenylamine, dissolved in water, and caustic soda are added to the diazodisazo compound thus obtained and coupling is brought to an end at a pH of 10. The nitrotrisazo compound obtained is reduced in the reaction mixture at 40° with a solution of 117 parts of sodium sulphide in water. The dyestuff is separated by sprinkling in common salt and adjusting the pH to 1.5. The dyestuff thus obtained is mixed with dilute hydrochloric acid and is diazotised by adding in drops 70 parts of sodium nitrite solution. 199 parts of 3-hydroxy-2'-methyldiphenylamine, dissolved in water, and caustic soda are added to the diazotised dyestuff and are coupled at a pH of 10.

The dystuff thus obtained is precipitated with acid. It is a black powder which dyes leather, paper, natural or synthetic polyamides or cotton in deep black shades.

If 2-chloro-4-nitroaniline, 2-sulpho-4-nitroaniline or 2-methoxy-4-nitroaniline is used instead of p-nitroaniline, black dyestuffs with equally good properties are obtained. In Table 2 is given the structure of further dyestuffs which may be produced similarly to that of Example 68 and which in the form of the free acid correspond to formula I wherein the X's, A₁ and C₁ are sulpho, B₁ is hydrogen and Y and --K₁ and --K₂ have the definitions given in the corresponding columns and M signifies hydrogen.

                                      Table 2                                      __________________________________________________________________________                                                     Shade of                       Ex.                                             dyeing on                      No.                                                                               Y  K.sub.1                   K.sub.2         leather                        __________________________________________________________________________     69 H                                                                                  ##STR85##                                                                                           ##STR86##           black                          70 H  "                                                                                                    ##STR87##           "                              71 H  "                                                                                                    ##STR88##           "                              72 H  "                                                                                                    ##STR89##           "                              73 H  "                                                                                                    ##STR90##           "                              74 H  "                                                                                                    ##STR91##           "                              75 H  "                                                                                                    ##STR92##           "                              76 H  "                                                                                                    ##STR93##           "                              77 H  "                                                                                                    ##STR94##           blue-black                     78 H  "                                                                                                    ##STR95##           "                              79 H  "                                                                                                    ##STR96##           "                              80 H  "                                                                                                    ##STR97##           "                              81 H  "                                                                                                    ##STR98##           "                              82 H                                                                                  ##STR99##                                                                                           ##STR100##          green                          83 H  "                                                                                                    ##STR101##          "                              84 H  "                                                                                                    ##STR102##          "                              85 H  "                                                                                                    ##STR103##          "                              86 H  "                                                                                                    ##STR104##          "                              87 H  "                                                                                                    ##STR105##          "                              88 H  "                    same as Example 29   "                              89 H  "                                                                                                    ##STR106##          black                          90 H  "                                                                                                    ##STR107##          "                              91 H  "                                                                                                    ##STR108##          "                              92 H  "                                                                                                    ##STR109##          "                              93 H  "                                                                                                    ##STR110##          "                              94 H  "                                                                                                    ##STR111##          "                              95 H  "                                                                                                    ##STR112##          "                              96 H  "                    same as Example 29   "                              97 H  "                                                                                                    ##STR113##          "                              98 H  "                                                                                                    ##STR114##          "                              99 H  "                                                                                                    ##STR115##          dark green                     100                                                                               H  "                                                                                                    ##STR116##          "                              101                                                                               H                                                                                  ##STR117##                                                                                          ##STR118##          green                          102                                                                               H  "                                                                                                    ##STR119##          "                              103                                                                               H  "                                                                                                    ##STR120##          "                              104                                                                               H  "                                                                                                    ##STR121##          "                              105                                                                               H  "                                                                                                    ##STR122##          green-black                    106                                                                               H  "                                                                                                    ##STR123##          black                          107                                                                               H  "                                                                                                    ##STR124##          "                              108                                                                               H  "                                                                                                    ##STR125##          "                              109                                                                               H  "                                                                                                    ##STR126##          "                              110                                                                               H  "                                                                                                    ##STR127##          "                              111                                                                               H                                                                                  ##STR128##                                                                                          ##STR129##          blue                           112                                                                               H  "                                                                                                    ##STR130##          "                              113                                                                               H  "                                                                                                    ##STR131##          "                              114                                                                               H  "                                                                                                    ##STR132##          blue-black                     115                                                                               H  "                                                                                                    ##STR133##          "                              116                                                                               H  "                                                                                                    ##STR134##          black                          117                                                                               H  "                                                                                                    ##STR135##          "                              118                                                                               H  "                                                                                                    ##STR136##          "                              119                                                                               H  "                                                                                                    ##STR137##          "                              120                                                                               H  same as Example 29                                                                                   ##STR138##          green                          121                                                                               H  same as Example 29                                                                                   ##STR139##          "                              122                                                                               H  same as Example 29                                                                                   ##STR140##          "                              123                                                                               H  same as Example 29                                                                                   ##STR141##          "                              124                                                                               H  same as Example 29                                                                                   ##STR142##          "                              125                                                                               H  same as Example 29                                                                                   ##STR143##          black                          126                                                                               H  same as Example 29                                                                                   ##STR144##          "                              127                                                                               H  same as Example 29                                                                                   ##STR145##          "                              128                                                                               H  same as Example 29                                                                                   ##STR146##          "                              129                                                                               H                                                                                  ##STR147##                                                                                          ##STR148##          "                              130                                                                               H  "                                                                                                    ##STR149##          "                              131                                                                               H  "                                                                                                    ##STR150##          "                              132                                                                               H  "                                                                                                    ##STR151##          "                              133                                                                               H                                                                                  ##STR152##                                                                                          ##STR153##          blue-black                     134                                                                               H  "                                                                                                    ##STR154##          blue                           135                                                                               H  "                                                                                                    ##STR155##          black                          136                                                                               H                                                                                  ##STR156##                                                                                          ##STR157##          blue-black                     137                                                                               H  "                                                                                                    ##STR158##          blue                           138                                                                               H  "                                                                                                    ##STR159##          black                          139                                                                               H                                                                                  ##STR160##                                                                                          ##STR161##          blue-black                     140                                                                               H  "                                                                                                    ##STR162##          blue                           141                                                                               H  "                                                                                                    ##STR163##          black                          142                                                                               H                                                                                  ##STR164##                                                                                          ##STR165##          blue-black                     143                                                                               H  "                                                                                                    ##STR166##          blue                           144                                                                               H  "                                                                                                    ##STR167##          black                          145                                                                               H                                                                                  ##STR168##                                                                                          ##STR169##          blue-black                     146                                                                               H  "                                                                                                    ##STR170##          blue                           147                                                                               H  "                                                                                                    ##STR171##          black                          148                                                                               H                                                                                  ##STR172##                                                                                          ##STR173##          blue-black                     149                                                                               H  "                                                                                                    ##STR174##          blue                           150                                                                               H  "                                                                                                    ##STR175##          black                          151                                                                               H                                                                                  ##STR176##                                                                                          ##STR177##          blue-black                     152                                                                               H  "                                                                                                    ##STR178##          blue                           153                                                                               H  "                                                                                                    ##STR179##          black                          154                                                                               H                                                                                  ##STR180##                                                                                          ##STR181##          blue-black                     155                                                                               H  "                                                                                                    ##STR182##          blue                           156                                                                               H  "                                                                                                    ##STR183##          black                          157                                                                               H                                                                                  ##STR184##                                                                                          ##STR185##          blue-black                     158                                                                               H  "                                                                                                    ##STR186##          blue                           159                                                                               H  "                                                                                                    ##STR187##          black                          __________________________________________________________________________

DYEING EXAMPLE A

100 Parts of newly tanned and neutralised chromium grain leather are milled for 30 minutes in the dye tub in a liquor consisting of 250 parts of water at 55° and 1 part of the dyestuff of Example 1. They are treated for a further 30 minutes in the same bath with 2 parts of an anionic fat-liquor based on sulphonated train oil, and the leathers are dried and curried in the usual manner. A very evenly dyed black leather is obtained.

DYEING EXAMPLE B

100 parts of calf suede are milled for 4 hours in the dye tub with 1000 parts of water and 2 parts of ammonia, and they are subsequently dyed in a new bath. 500 parts of water at 55°, 2 parts of ammonia, 10 parts of the dissolved dyestuff of Example 1 are dyed for 11/2 hours in the dye tub, together with the calf leather which has already been milled. In order to exhaust the dyebath, 4 parts of formic acid (85%) are slowly added, the dyeing continues until the dyestuff has been fixed completely. The suede leathers which are rinsed, dried and curried in the normal manner result in a very evenly dyed, deep black suede, after buffing the suede side.

DYEING EXAMPLE C

100 Parts of lamb's leather, chromium-vegetable tanned, and 10 parts of the dyestuff of Example 1 are milled for 45 minutes in the dye tub in a liquor consisting of 1000 parts of water at 55° and 1.5 parts of an anionic emulsion of spermaceti oil, and the dyestuff is fixed on the leather by slowly adding 5 parts of formic acid (85%) for 30 minutes. After the usual drying and currying processes, a leather is obtained in a very even deep black shade.

DYEING EXAMPLE D

A solution of 20 parts of the dyestuff of Example 1 in 847 parts of water, 150 parts of ethylene glycol and 3 parts of formic acid (85%) is applied by spraying, plushing and coating to the grain side of a buffed, compound-tanned cow hide. The leather is dried and curried under mild conditions. A leather is obtained in a deep black shade, with very good fastness properties.

DYEING EXAMPLE E

260 ml of water at 50°-60° are placed in a 500 ml dye beaker which is located in a heatable water bath, and 10 ml of 10% sodium sulphate solution, as well as 1 ml of 10% sodium carbonate solution are added. 0.25 g of the dyestuff of Example 1 are made into a good paste with 2 ml of cold water, and 30 ml of warm water (50°-60°) are added; the dyestuff then dissolves. The dye solution is added to the prepared bath and 10 g of cotton fabric are kept in constant movement in this dyebath. The temperature of the dye bath is increased over the course of 30 minutes to 85°-90° and dyeing continues at this temperature for 60 minutes. The dyed material is removed from the dyebath, the adhering liquor is removed by wringing out, and the material is rinsed for 5-10 minutes in cold water and dried at 60°-70°.

DYEING EXAMPLE F PAPER

(a) 100 parts of chemically bleached sulphite cellulose (of conifer or hard-wood) are ground in a hollander in 2000 parts of water. 4 parts of the dyestuff of Example 1 are added to this pulp as a powder or in solution. After 15 minutes, sizing takes place, and subsequently fixation. Paper produced from this pulp has a deep black dyeing with good fastness to the wet and to light.

(b) 70 parts of chemically bleached sulphite cellulose (of conifer wood) and 30 parts of chemically bleached sulphite cellulose (of birchwood) are beaten in a pulper in 2000 parts of water. 0.4 parts of the dyestuuf of Example 1 are sprinkled into this pulp or are added as a solution. Paper is produced from this pulp after 20 minutes. The paper produced from this pulp is dyed grey and has good colour fastness.

By replacing the dyestuff of Example 1 in the above Examples A-F by the corresponding amount of one of the dyestuffs of Examples 2 to 159, further dyeings are obtained.

In the above dyeing examples, the dyestuffs are used in blended form with sodium carbonate. 

What is claimed is:
 1. A compound of the formula ##STR188## wherein each of A₁, B₁ and C₁ is independently hydrogen or --SO₃ M, with the proviso that when A₁ is --SO₃ M, one of B₁ and C₁ is --SO₃ M and the other is hydrogen and when A₁ is hydrogen, B₁ is --SO₃ M and C₁ is hydrogen,Q is --NH₂, --NO₂, acylamino or K₃ --N═N--,wherein K₃ is a coupling component radical free of diazotizable amino groups, Q' is --NH₂ --NO₂, acylamino or --N═N--K₄,wherein K₄ is a coupling component radical free of diazotizable amino groups, each X is hydrogen or --SO₃ M, with the proviso that the two X's are the same, Y is hydrogen, C₁₋₄ alkyl, C₁₋₄ alkoxy, hydroxy, fluoro, chloro, bromo, --COOM or --SO₃ M, and each M is hydrogen or a non-chromophoric cation, with the proviso that when Q is K₃ --N═N--, Q' is --NH₂ or acylamino.
 2. A compound according to claim 1 wherein Q' is --NH₂ when Q is K₃ --N═N--.
 3. A compound according to claim 2 having the formula ##STR189## wherein each of A₁, B₁ and C₁ is independently hydrogen or --SO₃ M, with the proviso that when A₁ is --SO₃ M, one of B₁ and C₁ is --SO₃ M and the other is hydrogen and when A₁ is hydrogen, B₁ is --SO₃ M and C₁ is hydrogen,Q is --NH₂, --NO₂ or acylamino, Q' is --NH₂, --NO₂ or acylamino, each X is hydrogen or --SO₃ M, with the proviso that the two X's are the same, Y is hydrogen, C₁₋₄ alkyl, C₁₋₄ alkoxy, hydroxy, fluoro, chloro, bromo, --COOM or --SO₃ M, and each M is hydrogen or a non-chromophoric cation.
 4. A compound according to claim 3 whereinQ is --NH₂, --NO₂, formamido or (C₁₋₄ alkyl)carbonylamino, and Q' is --NH₂, --NO₂, formamido or (C₁₋₄ alkyl)carbonylamino.
 5. A compound according to claim 4 whereinQ is --NH₂, --NO₂, formamido or acetamido, and Q' is --NH₂, --NO₂, formamido or acetamido.
 6. A compound according to claim 5 wherein Q is --NO₂, formamido or acetamido.
 7. A compound according to claim 6 wherein Q' is --NH₂.
 8. A compound according to claim 5 whereinQ is --NH₂, and Q' is --NO₂, formamido or acetamido.
 9. A compound according to claim 5 whereinQ is --NO₂, and Q' is --NO₂.
 10. A compound according to claim 9 whereinA₁ is --SO₃ M, B₁ is hydrogen, C₁ is --SO₃ M, each X is --SO₃ M, and Y is hydrogen.
 11. A compound according to claim 5 whereinQ is --NH₂, and Q' is --NH₂.
 12. A compound according to claim 11 whereinA₁ is --SO₃ M, B₁ is hydrogen, C₁ is --SO₃ M, each X is --SO₃ M, and Y is hydrogen. 